is_same_bitmap - Tells if two bitmaps describe the same drawing surface. Allegro game programming

       Returns TRUE if the two bitmaps describe the same drawing surface, ie.  the pointers are equal, one is  a
       sub-bitmap of the other, or they are both sub-bitmaps of a common parent.

       is_same_bitmap  -  Tells  if  two  bitmaps  describe  the  same drawing surface. Allegro game programming
       library.

create_sub_bitmap(3alleg4)

Allegro                                           version 4.4.3                          is_same_bitmap(3alleg4)

#include<allegro.h>intis_same_bitmap(BITMAP*bmp1,BITMAP*bmp2);